Question about Peacock Eel behavior

[KINGMED]

Have two peacocks and they are doing great, I feed them every 2-3 days frozen bloodworms one time and frozen brine shrimp the other. I also feed other foods each day to the other fish, so they are very well fed. I change water about every 5-7 days (approx. 8 gallons ). My question to ask it that one of the eels/fish seems to hang off the heater every so often, the water temperature is around 76 degrees so I'm thinking it's not to cool, just don't don't if this is a problem?, the eel does swim away when I touch him and he acts very healthy. I'm thinking the eel is just hanging out where ever and he/she finds this a comfortable spot?

[Cory Catfish]

I'm thinking the eel is just hanging out where ever and he/she finds this a comfortable spot?
That's it. If the water was too cold the eels would be acting sluggish or stiff.

[mantis]

I've had my eels do that as well, sometimes they look impaled to fake plants. My waters around 78.